I think this old vid gives a good explanation why fan jets are better than using pencil jets.
Each to their own though as some ppl can't get on using fan jets for some strange reason but I think they are better myself.
https://www.youtube.com/watch?v=4SORg3AQ8nw
Its always strange how people justify using certain pieces of equipment, if the water isn't rinsing properly on pencil jets
then fans aren't going to make any difference, instead of one inch of water bouncing off the hydrophobic glass you may have three but at the end of the day the glass will still repel it.
As long as your not too splash and dash then the scrub will have removed the majority of the dirt as your also rinsing while
scrubbing, the rinse without the scrub is more of a comfort blanket that may remove a little at the end or the odd cobweb.
Hydrophobic glass is a good example of this,it repels water so it doesn't matter what you do it will still repel it, but luckily for
us we don't need to actually touch the glass with water to clean it we just need to grab the dirt and rinse it off.
The brush is what removes the dirt on hydrophobic glass as its the only thing that touches it, the shape of the jet and the rinse for that matter does very little.